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dotkeykong he/she  1yr ago (text post) 561 thread views #129189

Advent of Code day 6

was preparing my butthole after the last one but ended up being the fastest one i've done :marseyexcited:

with open("day6input.txt") as f:
    input = f.read()

# part 1

for i in range(len(input)):
    marker = set(input[i:i+4])
    if len(marker) == 4:
        answer = i + 4
        break

print(answer)

# part 2 

for i in range(len(input)):
    marker = set(input[i:i+14])
    if len(marker) == 14:
        answer = i + 14
        break

print(answer)
28
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My brute force solution

#include <iostream>

#define PREAMBLE_WINDOW_SIZE 4
#define MESSAGE_WINDOW_SIZE 14

inline bool contains_duplicates(const std::string& window)
{
  // O(n²) meh
  for(size_t i = 0; i < window.length(); i++)
    for(size_t j = 0; j < window.length(); j++)
      if(i != j and window[i] == window[j])
        return 1;
  return 0;
}

int main()
{
  std::string line;
  std::getline(std::cin, line);
  size_t i = 0;

  for(; i < line.length() - PREAMBLE_WINDOW_SIZE; i++)
  {
    if(not contains_duplicates(line.substr(i, PREAMBLE_WINDOW_SIZE)))
    {
      // PART A
      //std::cout << (i + PREAMBLE_WINDOW_SIZE) << std::endl;
      // return 0;
      break;
    }
  }

  for(; i < line.length() - MESSAGE_WINDOW_SIZE; i++)
    if(not contains_duplicates(line.substr(i, MESSAGE_WINDOW_SIZE)))
    {
      // PART B
      std::cout << (i + MESSAGE_WINDOW_SIZE) << std::endl;
      return 0;
    }

  return -1;
}

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based and sexy Indian dude pilled

trans lives matter

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iostream :!marseyyikes:

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Hi @JollyMoon,

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